A spatially continuous transitional zone between two or more ecological communities in which species composition, physical conditions, and ecosystem processes change gradually or along gradients; in archaeological contexts, ecotones are loci where human use, resource availability, and differential preservation interact to produce distinctive site distributions and taphonomic patterns.

Principle

Because ecotones concentrate species and resources from adjacent communities and present distinct microenvironments, they tend to attract human activity and create spatially heterogeneous preservation and deposition patterns that differ from those found within the adjoining homogeneous communities.

Demonstration

Illustrative scenario → A riverine–woodland ecotone adjacent to a prehistoric campsite creates a narrow belt where edible plants, game trails, and raw materials overlap. Recognition → Artefact scatters and charcoal concentrations are denser within the ecotone than 100 m into the woodland or into the floodplain. Action → Excavators target sampling transects across the gradient and record differential bone fragmentation and charcoal preservation tied to soil moisture. Consequence → Interpretation locates repeated short-term occupation and explains selective preservation of organic remains in the ecotone compared with neighboring units.

Misapplication

Mistakenly treating an ecotone as an abrupt, impermeable boundary and assigning all finds on one side to a single ecological regime. Semantic error: categorical boundary assumption ignores gradients and microhabitats, producing false attributions of resource use and climate proxies.

Consequence

A correct recognition alters sampling design, spatial analysis, and taphonomic expectations (for example, targeted transects and expectations of mixed assemblages). Failure to account for an ecotone can bias reconstructions of subsistence, mobility, and landscape use and lead to incorrect inferences about site absence or density.

Reversal

Where human modification, rapid environmental change, or very fine spatial scales have homogenized conditions, the apparent ecotone may be ephemeral, anthropogenic, or indistinguishable from one adjoining community; under these conditions the ecotone model does not predict increased human aggregation or distinctive preservation patterns.

Boundary

Clearly within: a gradual biotic and edaphic gradient between mature forest and grassland hosting mixed-flora and mixed-fauna foraging. Boundary case: a narrow riparian strip whose width varies seasonally. Clearly outside: an abrupt artificial boundary (e.g., a fence line) that separates land use but does not reflect ecological gradients.

Semantic Tension

Scale and resolution: ecological gradients operate continuously, while archaeological sampling and human decision-making are discrete; resolving this tension requires explicit spatial scale choices in field strategy.

Synthesis

Ecotone should be treated as an active interface—both an attractor for diverse human activities and a modifier of preservation—so archaeological interpretations must combine ecological gradients with targeted sampling and taphonomic expectations.